Re: Power for Audio


"Scott Dorsey" <kludge@xxxxxxxxx> wrote in message
news:dro11e$j5d$1@xxxxxxxxxxxxxxxxxxx
> TimPerry <timperry@xxxxxxxxxxxxxxxxxxx> wrote:
>>
>>i have personally had a discussion with a S. Cal Edison engineer: he
>>denies
>>that it is possible for "dirty" power to exist. this was in relation to
>>frequent cycling of small UPS units.
>>we all know better, but it sure didnt get me anywhere.
>
> A scope and a polaroid camera will. "I saw THIS CRAP on my power line!
> Fix it!" usually does a lot. Power guys don't think like audio guys.
> Power
> guys don't really pay much attention to line waveforms; they think about
> loads only in terms of power factor (ie. load reactance) and not much
> else. As loads today are getting more and more bizarre, this is a
> mistake.

The modern version of this might be a PC, some recording software, and an
audio interface. 100 KHz bandpass should suffice to capture disturbances
that actually make it though a good power supply and into the audio works.
Interfacing to the power line would take some care.

Some aggressive high pass filtering with DAW software could make any
transients stand out. Enlarging the affected time segment would make a nice
screen dump for documentation.



.

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